The Metric System. Most scientists use the metric system when collecting data and performing experiments
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1 Scientific Measurement
2 The Metric System Most scientists use the metric system when collecting data and performing experiments
3 The Metric System Most scientists use the metric system when collecting data and performing experiments The metric system is a decimal system of measurement whose units are based on multiples of 10 The basic unit of length, the meter, can be multiplied or divided to measure objects and distances much larger or smaller than a meter. The same process can be used when measuring volume and mass.
4 The Metric System Length (meter) = The distance from one point to another
5 The Metric System Length (meter) = The distance from one point to another Mass (gram) = A measure of how much matter is in an object
6 The Metric System Length (meter) = The distance from one point to another Mass (gram) = A measure of how much matter is in an object Volume (liter) = The amount of space that matter occupies
7 The Metric System Length (meter) = The distance from one point to another Mass (gram) = A measure of how much matter is in an object Volume (liter) = The amount of space that matter occupies Temperature (degrees Celsius) = The amount of heat in something
8 Finding Mass Mass can be found using either a digital scale or a triple-beam balance When using a digital balance, be sure to zero the scale and then place the object on the pan
9 Finding Mass Triple-beam balances have three beams that show the mass of the object. The middle beam is grams and the rider is 100 grams The back beam is grams and the rider is 10 grams The front beam is 0-10 grams and the rider is 1 gram To find the mass of an object you place the object on the pan and move the riders until the pointer on the right of the balance stays pointed to zero Be sure that the pointer is at zero before you place the object on the pan
10 Finding Mass SOLID Place object on the pan and move the riders until the pointer stays at zero Add up the numbers on the beams where the riders are positioned to find the mass LIQUID Measure the mass of an empty container that can hold the liquid Measure the combined mass of the container and the liquid Subtract the mass of the container from the combined mass CHEMICAL Find the mass of a piece of weighing paper or empty container that will hold the chemical Add this amount to the desired mass of the chemical and preset the riders to this number Add the chemical to the weighing paper a little at a time until the pointer points to zero.
11 Finding Volume To find the volume of a regular object, such as a block, you multiply the length by the width by the height (Volume = LxWxH) Cubic centimeter To find the volume of a liquid you would use a graduated cylinder Liter, milliliter, etc. Always read a graduated cylinder at eye level and from the bottom of the meniscus (the curved surface)
12 Finding Volume Always check the unnumbered marks on a graduated cylinder to see how many sections there are and what they measure. Also, sometimes you have to estimate a measurement between two marks. You should find that both graduated cylinders to the right contain 25mL.
13 Finding Volume To find the volume of an irregular object you would use a graduated cylinder Add enough water to the graduated cylinder to cover the object Hold the graduated cylinder at an angle (to prevent cracking and splashing) and place the object into the graduated cylinder Slowly bring the graduated cylinder upright The volume of the object is the difference in water levels before and after the object was added
14 Finding Surface Area Surface area is the measure of how much exposed area a solid object has, expressed in square units The formula for surface area of a cube is length x width x the number of sides Surface Area = Length x Width x # of sides
15 Finding Density Density is the ratio of mass to volume The density of a specific kind of matter helps to identify it and to distinguish it from other kinds of matter The formula for density is mass divided by volume Density = Mass / Volume
16 Finding Density If the mass of the rock below is 40 grams, what is the density of the rock?
17 Prefixes in the Metric System (k) Hect to- (h) Deca a- (da) METER LITER GRAM MULTIPLY DIVIDE Cent ti- (c) Kilo- Deci- (d) Milli- (m) x1000 x100 x10 1 1/10 1/100 1/1000
18 Graphing A bar graph is used to display data in a number of separate, or distinct, categories Example = Types of pets that students own (the categories would be dog, cat, snake, etc.)
19 Graphing A line graph is used to display data that show how one variable (DV) changes in response to another variable (IV)
20 Graphing A line graph is used to display data that show how one variable (DV) changes in response to another variable (IV) Used when both variables are continuous (meaning that there are points between the ones you tested) Examples of continuous data include body mass, time, temperature, mass, volume, length, etc.
21 Graphing A line graph is used to display data that show how one variable (DV) changes in response to another variable (IV) Used when both variables are continuous (meaning that there are points between the ones you tested) Examples of continuous data include body mass, time, temperature, mass, volume, length, etc. Line graphs are useful because you can estimate values for conditions that you did not test in the experiment Example = If you measured 1ºC and 2ºC, using a line graph you could predict 1.5ºC
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